Electrostatic Probe Studies of the Nitrogen Pink Afterglow

Chen, Sin‐Li; Goodings, John M.

doi:10.1063/1.1670900

Cited by 29 publications

(13 citation statements)

References 16 publications

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“…This is not the case as shown in [1] and discussed by Chen and Goodings themselves. It should be better to compare our averaged energies uwith the kTe values reported in [10]. There is a satisfactory agreement at the beginning (1 ms) and at the end (12 ms) of the pink afterglow, with the present u value found at 01 = 8 500 K (cf.…”

Section: It Follows That the Recombination Time Issupporting

confidence: 78%

“…Comments on earlier experimental results. Some earlier experimental works [8][9][10] seem to indicate the lines expressed in this work as well as in [1]. The experimental work of Formato and Gilardini [8] appears in fact as an indication of the first regime.…”

Section: It Follows That the Recombination Time Issupporting

confidence: 65%

“…However our calculations cannot justify the maximum value of kTe = 4.5 eV experimentally found in [10]. In this case we must admit the creation of new energetic electrons by bimolecular reactions involving vibrationally excited molecules and/or metastable electronic state as well as superelastic collisions involving cold electrons and metastable N2 molecules.…”

Section: It Follows That the Recombination Time Ismentioning

confidence: 75%

“…Chen and Goodings [10] studying the « pink afterglow » of a NZ flowing post discharge at 9 torr obtained electron temperatures which reached a maximum value of 4.5 eV (t = 5 ms) starting from 2 eV (1 ms) and ending at 1 eV (12 ms). The electron temperature measured by probes in [10] seems too high as compared with our calculations. It should be noted however that the electron temperature concept only makes sense for a Maxwellian « edf ».…”

Section: It Follows That the Recombination Time Ismentioning

confidence: 99%

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Time scale considerations on the relaxation of electronic and vibrational energy distributions in a nitrogen afterglow

Capitelli¹,

Gorse²,

Ricard

1983

J. Phyique Lett.

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2014 La relaxation de la fonction de distribution en énergie des électrons (edf) dans une « postdécharge » d'azote vibrationnellement excité a été analysée à partir des temps caractéristiques nécessaires pour réaliser et maintenir un état quasi-stationnaire de « edf ». Ces temps caractéristiques sont ensuite comparés aux temps de pertes des électrons par recombinaison dissociative et par diffusion sur les parois du tube, qui sont les plus signibcatifs. Les résultats du calcul montrent que les collisions électroniques sur l'azote vibrationnellement excité peuvent créer un état quasi-stationnaire de « edf » dans des temps de 10-7 à 10-6 s(p = 5 torr, T = 500 K). Cet état quasi-stationnaire est caractérisé par une forte corrélation entre distribution vibrationnelle et énergie moyenne des électrons, et peut durer plusieurs 10-3 s jusqu'au temps où la densité électronique est devenue trop faible par recombinaison et diffusion.Finalement, on commente certains résultats expérimentaux publiés précédemment. Abstract. 2014 The relaxation of the electron energy distribution function (edf) in vibrationally excited N2 post discharges has been analysed by discussing the characteristic times necessary for « edf » to achieve and maintain a quasistationary state and by comparing these times with other important times corresponding to electron losses by dissociative recombination and diffusion to the tube wall. The calculated results show that the vibrational collisions can create a quasistationary « edf » in times of 10-7-10-6 s (p = 5 torr, T = 500 K). This quasistationary state is characterized by a strong correlation between vibrational distribution and mean electron energy. It can last up to several 10-3 s till the electron density becomes too small as a result of recombination and diffusion.Comments of some earlier experimental results are finally given.

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Section: It Follows That the Recombination Time Issupporting

confidence: 78%

Section: It Follows That the Recombination Time Issupporting

confidence: 65%

Section: It Follows That the Recombination Time Ismentioning

confidence: 75%

Section: It Follows That the Recombination Time Ismentioning

confidence: 99%

See 2 more Smart Citations

Time scale considerations on the relaxation of electronic and vibrational energy distributions in a nitrogen afterglow

Capitelli¹,

Gorse²,

Ricard

1983

J. Phyique Lett.

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“…It thus seems reasonable to expect emission currents of the order of the ion current. Several medium-pressure single probe studies (Chen and Goodings 1968, 1969, Chen et a1 1970, have attributed anomalously high ion current values to electron emission by metastable atoms or molecules; but little qualitat-0022-37271871010050 + 05 $02.50 @ 1987 IOP Publishing Ltd ive work has been done. Langmuir (1931) considered the diffusion limited current between two electrodes for Maxwellian and mono-energetic electron emission.…”

Section: Medium Pressurementioning

confidence: 99%

Effects of the Presence of an Iron Core on Toroidal Helical Magnetic Fields

Matsuoka¹,

Miyamoto²

1975

Jpn. J. Appl. Phys.

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This paper examines theoretically two different effects which are sometimes encountered in double probe measurements under continuum large-Debye-length conditions: (i) Electron emission due to the de-excitation of metastable atoms and molecules on the probe surface, and (ii) asymmetric double probe characteristics that result from number-density gradients on the plasma. Electron emission is shown to have little effect on the probe characteristics. A method of analysing asymmetric double probe characteristics is discussed.

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